393744487 has 4 divisors (see below), whose sum is σ = 399290256. Its totient is φ = 388198720.

The previous prime is 393744479. The next prime is 393744493. The reversal of 393744487 is 784447393.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 393744487 - 2³ = 393744479 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 393744487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393744287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2772778 + ... + 2772919.

It is an arithmetic number, because the mean of its divisors is an integer number (99822564).

Almost surely, 2^393744487 is an apocalyptic number.

393744487 is a deficient number, since it is larger than the sum of its proper divisors (5545769).

393744487 is an equidigital number, since it uses as much as digits as its factorization.

393744487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545768.

The product of its digits is 2032128, while the sum is 49.

The square root of 393744487 is about 19842.9959179555. The cubic root of 393744487 is about 732.9451836861.

The spelling of 393744487 in words is "three hundred ninety-three million, seven hundred forty-four thousand, four hundred eighty-seven".